28561625 has 16 divisors (see below), whose sum is σ = 36520848. Its totient is φ = 22288000.

The previous prime is 28561609. The next prime is 28561627. The reversal of 28561625 is 52616582.

It can be written as a sum of positive squares in 8 ways, for example, as 24334489 + 4227136 = 4933^2 + 2056^2 .

It is not a de Polignac number, because 28561625 - 2⁴ = 28561609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28561627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2339 + ... + 7911.

It is an arithmetic number, because the mean of its divisors is an integer number (2282553).

Almost surely, 2^28561625 is an apocalyptic number.

28561625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28561625 is a deficient number, since it is larger than the sum of its proper divisors (7959223).

28561625 is an equidigital number, since it uses as much as digits as its factorization.

28561625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5629 (or 5619 counting only the distinct ones).

The product of its digits is 28800, while the sum is 35.

The square root of 28561625 is about 5344.3077194338. The cubic root of 28561625 is about 305.6757390706.

It can be divided in two parts, 28561 and 625, that multiplied together give a 4-th power (17850625 = 65⁴).

The spelling of 28561625 in words is "twenty-eight million, five hundred sixty-one thousand, six hundred twenty-five".